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Table 2 Comparison of mean maternal age at birth of the Beijing Stars and Rain Education Institute for Autism (SR) children with a parent-reported diagnosis of autism spectrum disorder (ASD) orautistic tendenciesand that of general population

From: Statistical analysis of twenty years (1993 to 2012) of data from mainland China’s first intervention center for children with autism spectrum disorder

Year SR children General population P value derived from Mann-Whitney test
n Mean (standard deviation) age at childbirth n Mean (standard deviation) age at childbirth
2000 134 27.69 (3.33)a 1181803 26.29 (4.12)c 1.63e-07
2010 64 29.78 (3.71)b 1157270 27.68 (5.98)d 5.93e-06
  1. aMaternal age at birth of 134 children of the SR with a parent-reported diagnosis of ASD or ‘autistic tendencies’ born between 1 November 1999 and 31 October 2000.
  2. bMaternal age at birth of 64 children of the SR with a parent-reported diagnosis of ASD or ‘autistic tendencies’ born between 1 November 2009 and 31 October 2010.
  3. cMaternal age at birth of 1,181,803 children between 1 November 1999 and 31 October 2000 from China’s 2000 census data.
  4. dMaternal age at birth of 1,157,270 children between 1 November 2009 and 31 October 2010 from China’s 2010 census data.